Saturday, 6 October 2012

~~Welcome To The World of Animals~~


~~Animal Classification~~

An animal class is made up of animals that are all alike in important ways.  Scientists have grouped animals into classes to make it easier to study them.There are many different animal classes and every animal in the world belongs to one of them.  The five most well known classes of vertebrates (animals with backbones) are mammals, birds, fish, reptiles, amphibians.  They are all part of the phylum chordata -- I remember "chordota" by thinking of spinal chord.

There are also a lot of animals without backbones.  These are called invertebrates and are part of the phylum arthropoda (arthropods).  Two of the most commonly known classes in this phylum are arachnids (spiders) and insects.

Animals can be classified into 5 groups : -



                           

1. Mammals              2. Reptiles                3. Birds

4. Amphibians

5. Fish





1. Mammals 

People are mammals.  So are dogs, cats, horses, duckbill platypuses, kangaroos, dolphins and whales.  What do all these animals have in common, you ask?

The answer is – MILK!  If an animal drinks milk when it is a baby and has hair on its body, it belongs to the mammal class. The characteristics of mammals are : -
  •  give birth to 'live young'
  •  have hair or fur
  •  mammals mothers nurse their young with milk
  •  warm-blooded





2. Reptiles 
 

Reptiles are a class of animal with scaly skin.  They are cold blooded and are born on land.
Snakes, lizards, crocodiles, alligators and turtles all belong to the reptile class. 
The characteristics of reptiles are : -
  •  have scales, not fur
  •  have dry skin
  •  usually lay eggs, sometimes live young
  •  cold-blooded
                                                                             




3. Birds

Birds are animals that have feathers and that are born out of hard-shelled eggs. Some people think that what makes an animal a bird is its wings.  Bats have wings.  Flies have wings.  Bats and flies are not birds.  So what makes an animal a bird?

The answer is feathers! All birds have feathers and birds are the only animals that do.  The feathers on a bird’s wings and tail overlap.  Because they overlap, the feathers catch and hold the air.  This helps the bird to fly, steer itself and land. The characteristics of birds are : -
  • have feathers & wings
  • lay eggs
  • warm-blooded






4. Amphibians
Amphibians are born in the water.  When they are born, they breath with gills like a fish.  But when they grow up, they develop lungs and can live on land. The characteristics of amphibians are : -

  • live on land & in water
  • lay eggs
  • moist skin
  • webbed feet 
  • cold-blooded





5. Fish

Fish are vertebrates that live in water and have gills, scales and fins on their body.  There are a lot of different fish and many of them look very odd indeed.  There are blind fish, fish with noses like elphants, fish that shoot down passing bugs with a stream of water and even fish that crawl onto land and hop about! The characteristics of fish are : -
  • breathe under water using gills
  • have scales & fins
  • lay eggs
  • cold-blooded

       
                                                      
                                                                                                         
  



Reproduction of Animals
All animals reproduce. Some animals reproduce by giving birth and some animals reproduce by laying eggs.


Animals that Give Birth To Their Young
All mammals except the platypus give birth to their young. Mammal mothers nurse their young with milk. They take good care of their young. The examples of animals that give birth to their young are cows, tigers, elephants, rabbits, whales etc.

Animals that Lay Eggs
Reptiles, birds, fish, insects and amphibians lay eggs. Only birds hatch their eggs and feed their young. The examples of animals that lay eggs are butterflies, frogs, birds, snakes, fish, turtles etc.




~~Animal Life Cycles~~

For animals, some changes may occur at different stages of life. These are usually changes in external features or outlook of the animals. Some animals only change in size or weight while others take on an entirely different look.

Animals that Grow Up (Simple Life Cycle)

Most animals including fish, mammals, reptiles and birds have very simple life cycles:
  • they are born (either alive from their mother or hatched from eggs)
     
  • they grow up
These animals have three stages -- before birth, young and adult.  The young are typically similar to the parent, just smaller.  The young slowly "grow" to become adults.


Animals that Undergo a Complete Metamorphosis (A Big Change)

Amphibians, like frogs and newts, have a slightly more complicated life cycle.  They undergo a metamorphosis:
  • they are born (either alive from their mother or hatched from eggs).
     
  • they spend their childhood under water, breathing with gills.
     
  • they grow into adults and move to the land, breathing with lungs.
Insects
These insects have four stages in their life cycle:
  • egg:    unborn stage.
  • larva:   young stage -- this is when most of the feeding is done.
               (they usually look like worms)
  • pupa:  inactive (no feeding) stage between larva and adult stages.
               (usually well camouflaged)
  • adult:   final, breeding stage.
                (they usually grow wings)


Animals that Undergo an Incomplete Metamorphosis

About 10% of insects go through an incomplete metamorphosis.  They do not have a pupa form -- these include dragonflies, grasshoppers and cockroaches.
These insects have three stages in their life cycle:
  • egg:    unborn stage.
     
  • larva:   young stage -- this is when most of the feeding is done.  
  • adult:   final, breeding stage - including wings.










 







                    











50 comments:

  1. Thanks for sharing, it is a nice blog. Keep it up ^^

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    Replies
    1. TQ! Let's learn together & share to each other...

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  3. Simple but useful note.Those pictures and videos are atrractive.Good job.Hope to read more.

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  4. Hi teacher i am YUNG HUI. I like your blog. It is interesting.XD

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    1. Tq Thau Bing, I'm just the beginner.....hv2 learn more for

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    1. Thank you Esther!! I hope u can learn something.. :)

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  7. Hi teacher, I am Yue Yee. I have learnt many things. Thank you ! :D

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    Replies
    1. My dearest Yue Yee,

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  8. Hi teacher, I am tai qin ni. I have learnt many things from this topic . thank you!

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  9. Teacher,,, i also learnt a lots of knowledge

    ReplyDelete
    Replies
    1. Thank you very much.. do u see ur lovely picture taken in the

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  10. This comment has been removed by the author.

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  11. This comment has been removed by the author.

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  12. teacher,, these knowledge is also very useful,, i can use at next year

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  13. teacher,, i also love your blog it is fantastic and interest.

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    Replies
    1. thanks...i hope u can learn something ~~

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    2. I learnt many things of Science ,, thank you teacher

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      hahah ^^

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  14. wow the blog is so cute and i have learn many things of science.
    From Joyce~

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    Replies
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      How's she recently ? Pls send my regards to her :) Tq..

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  16. i have learnt many things!! thanx teacher
    by my sister

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  17. i can use all those i learnt ,,,, for next year!!! thanx

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    by my sister

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